speed of boat in still water ---- x km/h
speed of current ----- 2 km/h

speed against current = x-2
speed with the current = x+2

time upriver = 12/(x-2)
time downriver = 12/(x+2)

equation:
12/(x-2) + 12/(x+2) = 2.5

hint: multiply both sides by (x+2)(x-2), simplify and you have your quadratic

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